test/Transforms/DeadArgElim/multdeadretval.ll

; This test sees if return values (and arguments) are properly removed when they
; are unused. All unused values are typed i16, so we can easily check. We also
; run instcombine to fold insert/extractvalue chains and we run dce to clean up
; any remaining dead stuff.
; RUN: llvm-as < %s | opt -deadargelim -instcombine -dce | llvm-dis | not grep i16

define internal {i16, i32} @test(i16 %DEADARG) {
        %A = insertvalue {i16,i32} undef, i16 1, 0
        %B = insertvalue {i16,i32} %A, i32 1001, 1
        ret {i16,i32} %B
}

define internal {i32, i16} @test2() {
        %DEAD = call i16 @test4()
        %A = insertvalue {i32,i16} undef, i32 1, 0
        %B = insertvalue {i32,i16} %A, i16 %DEAD, 1
        ret {i32,i16} %B
}

define internal i32 @test3(i16 %A) {
        %ret = call {i16, i32} @test( i16 %A )                ; <i32> [#uses=0]
        %DEAD = extractvalue {i16, i32} %ret, 0
        %LIVE = extractvalue {i16, i32} %ret, 1
        ret i32 %LIVE
}

define internal i16 @test4() {
        ret i16 0
}

define i32 @main() {
        %ret = call {i32, i16} @test2()                ; <i32> [#uses=1]
        %LIVE = extractvalue {i32, i16} %ret, 0
        %DEAD = extractvalue {i32, i16} %ret, 1
        %Y = add i32 %LIVE, -123           ; <i32> [#uses=1]
        %LIVE2 = call i32 @test3(i16 %DEAD)                ; <i32> [#uses=1]
        %Z = add i32 %LIVE2, %Y           ; <i32> [#uses=1]
        ret i32 %Z
}